AWS lightsail Distribution (CDN) with C/panel

I have done setup and configure CPANEL/WHM to host websites on AWS Lightsail (not WordPress site) and it is working fine. Now i have activated lightsail Distribution and attched whm/cpanel disk as per lightsail tutorial. But when i see Default lightsail Distribution domain i am getting this page https://xxxxxxxxxx.cloudfront.net/cgi-sys/defaultwebpage.cgi (If you are accessing a domain name and get a message stating that

Kindly help me where i am making mistake . I mean not pointing to my website and i am not using any bucket